The software calculates grain size statistics using both the Folk and Ward (1957) graphical method and the moment method .
Use the built‑in plotting functions to create grain‑size frequency curves, cumulative curves, and ternary diagrams.
The software produces diverse graphical outputs, such as , cumulative plots , and ternary diagrams (e.g., sand-silt-clay classification). Applications in Research
The program is highly valued for its ability to transform raw data into visual research tools: Frequency Plots : Displays the distribution of grain sizes within a sample. Cumulative Distribution Curves gradistat v 91 hot
Traditional weight-retained values from nested sieve stacks.
Developed by Simon J. Blott and Kenneth Pye, GRADISTAT was first published as part of a technical communication in the journal Earth Surface Processes and Landforms in 2001. The program runs within a Microsoft Excel spreadsheet, which makes it incredibly accessible and versatile. It calculates a comprehensive range of statistics, including the , both arithmetically (in metric units) and logarithmically (in phi units) using moment and Folk and Ward graphical methods. Perhaps most notably, the program can accept both standard and non-standard size data, and it can produce a range of graphical outputs including frequency and ternary plots.
If you find that GRADISTAT no longer runs on your modern version of Excel, consider using the GRADISTAT v8.0 update or the R‑based G2Sd package. But for many researchers, the original v9.1 – the “hot” version that appears in countless search queries and scientific citations – will remain a trusted companion in the laboratory and the field. The software calculates grain size statistics using both
Percentage data from devices such as the Beckman Coulter laser particle-size analyzer.
Version 9.1 became the industry standard. It was stable, accurate, and, crucially, free.
: Computes data via both the Method of Moments (arithmetic and geometric) and the traditional Folk and Ward graphical methods (logarithmic). Applications in Research The program is highly valued
Always verify the file: the genuine GRADISTAT is a macro‑enabled Excel file ( .xls or .xlsm ) of about 353 KB.
If you have specific you are trying to analyze, I can help you format it for input into the software.
(e.g., Folk or Shepard triangles) to show relative proportions of gravel, sand, and mud. 💻 Version History & Compatibility Release Date Compatibility Details Early 2000s The original published version for Excel 97/2000. Updated for use with Excel 2007 through 2010. v9.1 / PRO In Development
Runs entirely within MS Excel, allowing for easy data input, customization, and visualization.